I don't think it should have a name at all.
Just leave it how it is.
I agree, don't name it. I don't even like mBTC. Just satoshi for anything less than a full btc or simply write it out to the decimal. No confusion that way, is there?
So a base unit that defines assets not denominated in bitcoin (like gold) is not useful? Of course bitcoin traders have little use for this, but contract users have no base unit for trading other assets. They are forced to multiply by 0.0000546 BTC or use the term "dust" which is unmarketable.
Well then fucking call it a minB, for the minimum btc amount for all I care. But there are way, WAY too many units of measure in this world and the conversion factors become a nightmare after a while--or at the very best, an unnecessary inconvenience. And besides, that amount (0.00005460 btc) is not a fixed amount, am I right?